Shack-Hartmann Wavefront Sensor

ruinan · 发表于 2008-8-21 14:48:43

Features
Continuous Deformable Mirror (DM) Capable of Achieving High Spatial Resolution Shapes Due to High Actuator Count and Low Inter-Actuator Coupling
Highly Stable with Zero Hysteresis
Compact DM Driver Electronics with Built-In High Voltage Power Supply Suitable for Benchtop or OEM Integration
Shack-Hartmann Wavefront Sensor with High Resolution CCD Camera and High-Quality Microlens Array
Real-Time, High-Precision Wavefront Measurement and Correction
Choose from a Gold- or Aluminum-Coated Deformable Mirror
AO Kit Operating Wavelengths: 400 - 1100 nm for Al-Coated DM or 600 - 1100 nm for Au-Coated DM
All Collimation/Relay Optics and Associated Mounting Hardware Come Prealigned
Thorlabs has partnered with Boston Micromachines Corporation (BMC), a leading developer of advanced MEMS-based mirror products, to provide these new adaptive optics (AO) toolkits, which are capable of real-time wavefront compensation (see the Types of Aberrations tab for a discussion of the aberrations that the system can compensate). The AO system includes Thorlabs' WFS150C Shack-Hartmann Wavefront Sensor, which measures wavefront aberrations, BMC's 140 actuator Multi-DM MEMS deformable mirror system, which can change shape in order to modify a highly distorted optical wavefront, and real-time control software, which uses the information collected by the wavefront sensor to calculate the appropriate shape that the deformable mirror should assume in order to compensate for aberrations. Together, these three components operate in a closed-loop configuration to minimize aberrations (see the Tutorial tab for more information about these components). Using Thorlabs’ AO system, aberrations can be removed from the wavefront of the light being imaged, thereby increasing image resolution.

Two versions of the Multi-DM are available: AOK1-UM01 contains a DM with a gold mirror coating, and AOK1-UP01 contains a DM with an aluminum mirror coating (Refer to the Graphs tab for coating curve information). When combined with the WFS150C wavefront sensor, these two kits are designed for use in the 600 - 1100 nm range and the 400 - 1100 nm range, respectively. Regardless of the kit chosen, the three constituent components provide a closed-loop frame rate of 8 Hz when in the correction mode. Although the use of DMs in astronomy is well known, these miniature, precision wavefront control devices are also helping researchers to make breakthroughs in beam forming, microscopy, laser communication, and retinal imaging.

Shack-Hartmann Wavefront Sensor:
The WFS150C Shack-Hartmann wavefront sensor is equipped with a chrome mask microlens array (MLA150-5C) with an AR coating for the 200 - 1100 nm range and provides accurate, high-speed wavefront measurements of the beam shape and intensity distribution. This is done by analyzing the location and intensity of spots (spot field) formed by imaging a beam of light onto a CCD with a microlens array in front of it. With Thorlabs' Shack-Hartmann wavefront sensor, it is possible to measure the wavefronts of laser sources, characterize the wavefront aberrations caused by optical components, and provide real-time feedback for the control of the deformable mirror. The Shack-Hartmann Wavefront Sensor consists of a high resolution (1.3 Megapixels) USB 2.0 CCD camera, a microlens array, and analysis software. The full featured control and analysis software has a user-friendly graphical interface with menu-driven tools for camera settings, calibration, analysis, and display options. The SM1-threaded interface on the front of the CCD camera allows for the convenient mounting of ND filters, which help prevent camera saturation, and lens tubes, which reduce scattered light and allow for the mounting of additional optical components.

Deformable Mirror System:
Through a new partnership with Boston Micromachines Corporation (BMC), Thorlabs is pleased to offer BMC's Multi-DM micromachined deformable mirror system for advanced optical control as part of the Adaptive Optics Toolkit. Micro-electro-mechanical (MEMS) deformable mirrors are currently the most widely used technology in wavefront shaping applications given their versatility, maturity of technology, and the high resolution wavefront correction that they afford. The popular and versatile Multi-DM offers sophisticated aberration compensation in an easy-to-use package. The mirror consists of a mirror membrane that is deformed by 140 electrostatic actuators (i.e., a 12 x 12 actuator array with four inactive corner actuators), each of which can be individually controlled. These actuators provide 3.5 μm stroke over a compact area. Unlike piezoelectric mirrors, the electrostatic actuation used with BMC's mirrors ensures deformation without hysteresis. The AOK1-UM01 kit comes with a gold-coated Multi-DM while the AOK1-UP01 kit contains an aluminum-coated Multi-DM. In either case, there is also a protective 5o wedge in front of the mirror, which has a broadband AR coating for the 400-1100 nm range.

Control Software:
The control software provided with the adaptive optics kit is capable of minimizing wavefront aberrations by analyzing the signals from the Shack-Hartmann wavefront sensor and using those signals to determine the appropriate drive signals to send to the deformable mirror actuators so that the mirror can compensate for wavefront aberrations. The control software allows the user to monitor the wavefront corrections and intensity distribution in real time. In addition, user-defined aberrations can be introduced via the software, and wavefront deviations can be compared to this new user-defined reference.

ellision · 发表于 2009-2-19 23:33:02

很好的说明啊.大家有没有用过shack-hartman设计检查镜片coma,as等的设备呢? 可以一起交流下!

Shack-Hartmann Wavefront Sensor

发表回复

浏览过的版块


热搜: 防雾膜棒料红外反射膜光电二极管镀膜机反射膜光谱仪光电探头真空镀银滤光片光器件应用光学 zemax激光远心镜头 sio2 增透膜离子源栅网 zemax 论文高反膜半反半透膜